FED-STD-791D
4.3 Reactivity.
4 Materials which in themselves are readily capable of detonation or of explosive
decomposition or explosive reaction at normal temperatures and pressures.
Includes materials which are sensitive to mechanical or localized thermal shock.
If a chemical with this hazard rating is in an advanced or massive fire, the area
should be evacuated
3 Materials which in themselves are capable of detonation or of explosive
decomposition or of explosive reaction but which require a strong initiating
source or which must be heated under confinement before initiation. Includes
materials which are sensitive to thermal or mechanical shock at elevated
temperatures and pressures or which react explosively with water without
requiring heat or confinement. Fire fighting should be done from an
explosion-resistant location.
2 Materials which in themselves are normally unstable and readily undergo violent
chemical change but do not detonate. Includes materials which can undergo
chemical change with rapid release of energy at normal temperatures and
pressures or which can undergo violent chemical change at elevated
temperatures and pressures. Also includes those materials which may react
violently with water or which may form potentially explosive mixtures with
water. In advanced or massive fires, fire fighting should be done from a
protected location.
1 Materials which in themselves are normally stable but which may become
unstable at elevated temperatures and pressures or which may react with water
with some release of energy but not violently. Caution must be used in
approaching the fire and applying water.
0 Materials which are normally stable even under fire exposure conditions and
which are not reactive with water. Normal fire fighting procedures may be used.
U Unknown.
4.4 Material Index
Compound=s Name
Reactivity
Flammabilit
Health
Index
Number
Hazard
y Hazard
Hazard
001
Acetic Acid
2
1
2
002
1
0
Acetone
3
003
Ammonium Acetate
0
004
Ammonium Hydroxide
0
005
Ammonium Nitrate
0
3
1
2
006
Barium Chloride
0
0
007
Barium Hydroxide
008
Benzoic Acid
400
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